Sentences with phrase «called nitrogen cycle»

The so - called nitrogen cycle is a natural phenomenon that occurs in microcosm in the aquarium, but reef tanks need help to reduce nitrate levels.

Not exact matches

You'll see that the limits that most concern the biogeochemists are not the limits of drilling and mining (what we used to call «non-renewable resources») but rather the limits that are tied to overall system dynamics — the carbon and nitrogen cycles, biodiversity loss, and so on.